ASTM D3325-90(R2020) pdf free download

ASTM D3325-90(R2020) pdf free download,Standard Practice for Preservation of Waterborne Oil Samples
1. Scope
1.1 This practice covers the preservation of waterborne oil samples from the time of collection to the time of analysis. Information is provided to ensure sample integrity and to avoid contamination and to minimize microbial degradation. 1.2 The practice is for controlled field or laboratory condi- tions and specifies thorough preparation of equipment and precise operation. Where these details must be compromised in a field emergency, nonstandard simplifications are recom- mended that will minimize or eliminate consequent errors. N OTE 1—Procedures for the analysis of oil spill samples are Practices D3326, D3415, and D4489, and Test Methods D3650, D3327, D3328, and D3414. A guide to the use of ASTM test methods for the analysis of oil spill samples is found in Practice D3415. 1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appro- priate safety, health, and environmental practices and deter- mine the applicability ofregulatory limitations prior to use. 1.5 This international standard was developed in accor- dance with internationally recognized principles on standard- ization established in the Decision on Principles for the Development of International Standards, Guides and Recom- mendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
4. Summary of Practice
4.1 Special types of sample containers and shipping con- tainers are recommended. Samples may be ofseveral types: tar balls, collected oil, oil-water mixtures, emulsions, and oil and water on collecting devices such as silanized glass cloth, TFE-fluorocarbon polymer, or other materials. Instructions are given for the care of samples to minimize changes due to autoxidation and microbial attack between the time of sam- pling and the time of analysis. Services available for transpor- tation of samples are described.
5. Apparatus
5.1 Sample Containers—Borosilicate glass containers that have been thoroughly cleaned are preferable. All glass containers, new or used, must be thoroughly cleaned and washed prior to use. The cleaning steps consist of an initial wash with a warm aqueous detergent mixture followed by six hot tap water rinses, two rinses with reagent water, a rinse with reagent-grade acetone, and a final rinse with a solvent such as pentane, hexane, cyclohexane, dichloromethane, or chloroform followed by drying in a clean oven at 105°C or hotter for 30 min. If the glassware requires cleaning under field conditions, it should be washed with warm aqueous detergent followed by extensive water rinsing. A solvent rinse with acetone should be made, if possible, followed by lengthy air drying to remove residual solvent. (Warning—For safety reasons, the use of pentane, hexane, or cylcohexane is recommended over use of dichloromethane or carbon tetrachloride.) N OTE 2—Hot reagent water rinses are advisable where hot tap water might reintroduce contamination. 5.1.1 Plastic containers are not acceptable since volatile hydrocarbons diffuse readily through many commercial plastic containers or may be absorbed into the plastic. In addition, the plasticizer may dissolve in the sample causing misleading results. 5.1.2 Metal containers usually should be avoided because the nickel and vanadium determinations could be invalidated by introduction of metal from the can. 5.1.3 When field expedients must be employed, an empty container of each type used should be included in the shipment to the laboratory to be used as a blank to measure inadvertent contamination. 5.2 Closures—Proper choice of closures is critical to avoid contamination and to preserve sample. Use caps with aluminum-coated or TFE-fluorocarbon-coated cardboard in- serts. Aluminum foil sheet should not be used. Inserts of TFE-fluorocarbon sheet, however, are acceptable. 5.3 Refrigerator, explosion-proof at about 4 to 5°C. 5.4 Shipping Containers—Sturdy cartons or wooden boxes should be used. These should be sufficiently large so the sample containers are adequately surrounded by absorbent packing material, such as vermiculite, sufficient to absorb the entire contents should breakage occur and be lined with a grease proof plastic bag. N OTE 3—After Dec. 31, 1990, packagings used for shipment of dangerous goods such as oil must be tested for compliance with UN Performance Packaging Standards and certified by a marking applied by the packaging manufacturer.